Year	Percent
1976	4.69389
1977	14.26095
1978	-4.78954
1979	13.19894
1980	-0.38403
1981	18.78162
1982	6.05605
1983	6.17211
1984	-1.61124
1985	-0.26025
1986	6.24528
1987	-0.80631
1988	4.68443
1989	19.27055
1990	12.74096
1991	5.21627
1992	2.86418
1993	2.81749
1994	6.87433
1995	1.87268
1996	2.06113
1997	1.23851
1998	6.01882
1999	-0.4032
2000	-0.40767
2001	0.78056
2002	0.92225
2003	2.14881
2004	3.09181
2005	2.00661
2006	10.65164
2007	5.05064
2008	19.8691
2009	2.8262
2010	8.43046
2011	6.38651
2012	4.50064
2013	5.59977
2014	3.44432
2015	2.27243
2016	1.00752
2017	1.65433